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下面给出的程序在按钮单击时插入一个新的 JTextArea。每次在新行中插入新的 TextArea。该程序在 Linux 机器上运行良好，但在 Windows 机器上运行良好。在 Windows 机器上，它给了我 BadLocationException 。谁能告诉我这个问题的解决方案。提前致谢。

import javax.swing.JTextArea;
import javax.swing.text.BadLocationException;
import javax.swing.text.StyledDocument;

public class TestPane extends javax.swing.JFrame {

/** Creates new form TestPane */
StyledDocument doc = null;
public TestPane() {
    initComponents();
    doc = jTextPane1.getStyledDocument();
    //BoxLayout messageLayout = new BoxLayout(jScrollPane1,BoxLayout.PAGE_AXIS);
    //jTextPane1.setLayout(messageLayout);
}

/** This method is called from within the constructor to
 * initialize the form.
 * WARNING: Do NOT modify this code. The content of this method is
 * always regenerated by the Form Editor.
 */
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {

    jButton1 = new javax.swing.JButton();
    jScrollPane1 = new javax.swing.JScrollPane();
    jTextPane1 = new javax.swing.JTextPane();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

    jButton1.setText("jButton1");
    jButton1.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            jButton1ActionPerformed(evt);
        }
    });

    jScrollPane1.setViewportView(jTextPane1);

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(layout.createSequentialGroup()
                    .addGap(164, 164, 164)
                    .addComponent(jButton1))
                .addGroup(layout.createSequentialGroup()
                    .addContainerGap()
                    .addComponent(jScrollPane1,
                        javax.swing.GroupLayout.DEFAULT_SIZE, 376, Short.MAX_VALUE)))
            .addContainerGap())
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addContainerGap()
            .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE,
                 286, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
            .addComponent(jButton1)
            .addContainerGap(31, Short.MAX_VALUE))
    );

    pack();
}// </editor-fold>

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
    // TODO add your handling code here:
    jTextPane1.insertComponent(new JTextArea("hi this is StackOverflow "));
    jTextPane1.revalidate();
    insertEmptyLable();
}


private void insertEmptyLable() {
    try {
        doc.insertString
                (jTextPane1.getText().length(), "\n",
                null);
    } catch (BadLocationException ex) {
        ex.printStackTrace();
    }
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
    java.awt.EventQueue.invokeLater(new Runnable() {
        public void run() {
            new TestPane().setVisible(true);
        }
    });
}

// Variables declaration - do not modify
    private javax.swing.JButton jButton1;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JTextPane jTextPane1;
// End of variables declaration
}
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1 回答 1

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你真的是说insertComponent()每次actionPerformed()被叫都要做吗？我本来期望更像这样的东西：

private void insertMessage() {
    try {
        doc.insertString(jTextPane1.getText().length(),
           "Hi, this is StackOverflow.\n", null);
    } catch (BadLocationException ex) {
        ex.printStackTrace();
    }
}

附录：将此与您之前关于同一主题的问题进行比较，您应该考虑是否要在滚动窗格中插入文本或文本组件。此外，NetBeans 的 GUI 设计器已经相当成熟，但它不适合简短的示例。

于 2010-02-19T12:28:22.163 回答